Now uses \Drupal\Core\Field\FormatterInterface::getThirdPartySettings()

Update signature of hook_field_formatter_third_party_settings_form() to reflect changes in #2005434-63

Won't need it, earmarked for removal with a TODO

#1938262 - rip out the old hook_uninstall() implementation, as we'll rebuild this from scratch. Added a placeholder for hook_preuninstall().

Temporarily disabling summary message when no class is set, in order to demonstrate the bug reported in core issue #2029857 - Field formatter settings edit button doesn't show unless there is a settings summary.

Undefined Index fix, sometimes formatter settings are missing, if they haven't ever been saved! Refactored field_formatter_class_preprocess_field().

Changed the way we get the field instance settings. Now uses the new helper function introduced in field_formatter_settings.module 7.x-1.0

minor change: package name to Fields with capital F, 'cos that's what all the other Fields modules use.

Get ready for 7.x-1.0-rc1. Applied cumulative patch from #1290404-1. (Fixes issues #1290308, #1290324, #1290354, #1290384, #1390388.)